8 Reasons People Laugh About Your Rs485 Cable > 자유게시판

More and more people who work in plants need to understand how data from the field is transmitted to the control room and even to Manufacturing Execution Systems located in head offices situated considerable distances from the plant. Even better is Ethernet cable, because it is twisted and often shielded. If you use a twisted pair cable, make sure to use the same twisted pair for A and B, but use another twisted pair for GND. Use a 485 to USB serial cable, connect it to the interface of the 485 device and the computer's USB port, assign a COM port on the computer, open serial debugging assistant software, set the serial port parameters consistently, input the corresponding COM port, and monitor the data from the 485 device. If the serial port terminal device receives data but does not respond properly, monitor the data from the serial port device. The host software should attempt to connect to the device's IP and port to verify normal connectivity.

I tried connecting it directly to the computer either with a normal network cable or with a crossover cable but the web page doesn't open. Ensure SSCOM is added to the firewall, otherwise the firewall may block TCP connections, rs485 cable or test by temporarily disabling all firewalls on the computer. 2. Configure the IP of your RS485 and your computer to the same network address but different node address IP. If you restart the RS485 Master, every Brick/Bricklet of the RS485 network will send the initial enumeration message again. If you restart the RS485 Slave, only the Bricks/Bricklets that are connected to this stack will send the initial enumeration message again. A RS485 bus consists of one master and multiple slaves. You have to power up the slaves before the master, since the RS485 master searches for slaves only at startup. For master configuration choose "Master" as type and input the addresses of the slaves in the RS485 bus as a comma separated list.

We use 2 pair telephone cable for RS485 communication up to 1200 metres. If the bus is longer than a few meters then some kind of twisted pair cable is recommended. A good choice is to use a two pair, individually shielded, twisted pair cable such as Belden 3107A or equivalent or Belden's 3106A that has an extra ground conductor wire. 3106A is what I typically use to wire balanced audio. I have never been a fan of close loop communication and prefer to use a shunt and configure the inverter to stop at a set voltage. Wire up the RS485 stacks and set the termination switch on the first and last RS485 Extension in the bus to "on", as shown below. Rs485 cables not only vary in the structure of the core but also in the number of twisted pairs. The shielding minimizes the risk of signal degradation, making STP cables suitable for applications where data integrity is crucial.

These characteristics make RS-485 useful in industrial control systems and similar applications. RS-485 is used as the physical layer underlying many standard and proprietary automation protocols used to implement industrial control systems, including the most common versions of Modbus and Profibus. It does not support Modbus transmission. Question:Does RS485 TO ETH support Modbus transmission? As stated in the standard, a combination of signal A being low while signal B is high defines transmission of a logic 1. This is called "Mark." The reverse is true for logic 0, called "Space." This is illustrated in the figure below. The serial RS232 to RS485 converter and RS232 to RS422 converter units, also called serial converters, are small electronic devices used to convert a serial RS232 signal, (for example the COM port in older computers) into either RS485 or RS422 signals. Confirm hardware connections including serial port devices, and check if your gateway and energy meter are correctly connected. Confirm serial port parameters such as baud rate, data bits, and stop bits: Baud rate should be configured according to the connected RS485 device, commonly used rates are 9600 and 115200; Refer to the device manual or contact RS485 device technical support for configuration, especially if set to Modbus mode, confirm if the function code matches.